Pavel Heimlich has announced the release of an updated version of Korona 4.4.3: "Korona is the live DVD adding KDE4 packages on top of OpenSolaris. It is intended to be the showcase of the current state of the kde-solaris project, definitely not a distribution for any serious use."

I pretty much hated OpenSolaris from the start.
It felt slow, buggy, bloated and the package manager just felt a step backwards from what I was used to (I even preferred FreeBSD ports).

However, I ended up being lumped with OpenSolaris as I wanted a ZFS NAS which could also run virtual servers on top.
* NexentaCP 1 was buggy and VBox was so unstable it became unusable for more than 1 VM. (later versions might be OK, but I lost faith with them after it became clear that the Core range was just lip service to the open source community)
* FreeBSD's ZFS support was still only classed as "experimental" plus there seemed to be little in the way of virtulisation solutions for AMD64 (if I'm wrong about these points, please correct me)
* and Linux (ZFS-FUSE) did little to reassure me either.

So I've been running OpenSolaris for about 3 months now and it's starting to win me over. There's still a few niggles (mostly around SMB/CIFS hosting) but on the whole it seems pretty stable - if a little bloated for a NAS.